#include <iostream>

using namespace std;

typedef long long LL;

LL f[21];

int main()
{
	int n; cin >> n;
	f[0] = 1;
	for(int i = 1; i <= n; i++)
	{
		f[i] = f[i - 1] * (4 * i - 2) / (i + 1);
	}
	cout << f[n] << endl;
	return 0;
}
